Stack type oil cooler

The present invention relates to a stacked oil cooler which comprises: a pair of header units which is separated from each other; and a tube units wherein a flow path is formed so that oil can flow, and where multiple extruded tubes are stacked in order to be separated from one another and are inserted into the pair of header units at both end units. The extruded tube comprises: a tube body wherein a flow path is formed; multiple bulkheads which are placed inside the tube body in a longitudinal direction in order to divide the flow path into multiple channels; and an embossing unit which protrudes from the top surface, the bottom surface of the tube body, or respectively, and is formed along the longitudinal direction of the tube body. Therefore, the provided stacked oil cooler can increase a heat transfer area at an oil side and a coolant side through the embossing unit, can improve a heat transfer rate and heat radiating performance by inducing warm current when the coolant passes between the extruded tubes, can remove the need of an additional out pin, can reduce the number of components and the weight thereof through a simple structure of the header unit, and can be economical by reducing the costs thereof.